Size Characterisation Method and Detection Enhancement of Plasmonic Nanoparticles in a Pump-Probe System
Size Characterisation Method and Detection Enhancement of Plasmonic Nanoparticles in a Pump-Probe System
复制标题
DOI：
10.3390/app7080819
复制
发表时间：
2017-08-01
影响因子：
2.7
通讯作者：
Clark, Matt
中科院分区：
文献类型：
--
作者：
Fuentes-Dominguez, Rafael;Smith, Richard J.;Clark, Matt
金属纳米粒子的光学共振可以增强其主要振动模式的产生和检测。在这项工作中，我们证明了这种方法可以准确地表征粒子的大小，因为等离子体纳米粒子的振动频率只取决于它们的机械性能。此外，通过仔细选择颗粒大小和/或探针激光波长，在相同的照明条件下，检测到的信号可以增加一个大的因子（类似于9在这项工作中使用的颗粒）。最后，我们通过实验证明，由于点扩散函数内粒子的振动状态不同，可以观察到不同大小的粒子，这为实现超分辨率提供了可行的途径。
The optical resonance of metal nanoparticles can be used to enhance the generation and detection of their main vibrational mode. In this work, we show that this method allows the accurate characterisation of the particle's size because the vibrational frequency of plasmonic nanoparticles only depends on their mechanical properties. Moreover, by a careful selection of the particle size and/or probe laser wavelength, the detected signal can be increased by a large factor (similar to 9 for the particles used in this work) under the same illumination conditions. Finally, we show experimentally that particles of different sizes inside the point spread function can be observed due to the differences in their vibrational states, which could provide a feasible route to super-resolution.